What are the potential pitfalls of using header redirection in PHP for form processing?

One potential pitfall of using header redirection in PHP for form processing is that it may cause issues with form resubmission when a user refreshes the page after submitting the form. To avoid this problem, you can use the POST/redirect/GET design pattern, where after processing the form data, you redirect the user to a different page using the GET method to prevent form resubmission.

// Process form data
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data here
    
    // Redirect user to a different page using GET method
    header("Location: success.php");
    exit();
}